34_photo_graphs

34_photo_graphs - Lesson 34: Photoelectric Effect Graphs...

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Lesson 34: Photoelectric Effect Graphs Like many other topics in science, the results of the photoelectric effect can be better understood if the results are presented in a graph. It is important to be able to interpret these graphs correctly. The following graph is a typical example of how the photoelectric effect will be shown to you. Realize that some parts can be changed, and although this will change the graph (like flipping it around), the same essential information is there. The vertical axis is labeled as energy . If we're in the positive values, we're basically looking at the kinetic energy the electron has as it zips around. A negative energy value is how much energy it is lacking to be able to break off the metal it starts on. The horizontal axis is the frequency of the light striking the metal. Threshold Frequency The x-intercept is the threshold frequency of the material. This makes sense, since the electron will have zero kinetic energy when it has received a photon at the threshold frequency. The electron has just
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34_photo_graphs - Lesson 34: Photoelectric Effect Graphs...

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